Vacuum pump



FIG. 1 is a perspective view of the design of a vacuum pump in accordance with the invention as seen from the front;

FIG. 2 is a rear perspective view of the vacuum pump shown in FIG. 1;

FIG. 3 is a front elevational view of the vacuum pump shown in FIG. 1;

FIG. 4 is a rear elevational view of the vacuum pump shown in FIG. 1;

FIG. 5 is a right elevational view of the vacuum pump shown in FIG. 1;

FIG. 6 is a left elevational view of the vacuum pump shown in FIG. 1; and,

FIG. 7 is a top plan view of the vacuum pump shown in FIG. 1.

The bottom view of the design is plain and unadorned. 

CLAIM The ornamental design for a vacuum pump, as shown and described. 